WO2023005502A1 - 卷针套管、电池单体、电池、用电装置和卷绕装置 - Google Patents

卷针套管、电池单体、电池、用电装置和卷绕装置 Download PDF

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Publication number
WO2023005502A1
WO2023005502A1 PCT/CN2022/099570 CN2022099570W WO2023005502A1 WO 2023005502 A1 WO2023005502 A1 WO 2023005502A1 CN 2022099570 W CN2022099570 W CN 2022099570W WO 2023005502 A1 WO2023005502 A1 WO 2023005502A1
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WO
WIPO (PCT)
Prior art keywords
needle
sleeve
winding
electrode assembly
battery
Prior art date
Application number
PCT/CN2022/099570
Other languages
English (en)
French (fr)
Inventor
张小畏
张威
温裕乾
唐鸣浩
吴志阳
白清林
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to EP22848109.9A priority Critical patent/EP4243135A1/en
Priority to MX2023006603A priority patent/MX2023006603A/es
Publication of WO2023005502A1 publication Critical patent/WO2023005502A1/zh
Priority to US18/331,598 priority patent/US20230327175A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • H01M10/0409—Machines for assembling batteries for cells with wound electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/02—Supporting web roll
    • B65H18/04—Interior-supporting
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/08—Web-winding mechanisms
    • B65H18/10—Mechanisms in which power is applied to web-roll spindle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2405/00—Parts for holding the handled material
    • B65H2405/40—Holders, supports for rolls
    • B65H2405/45—Shafts for winding/unwinding
    • B65H2405/453—Passive holding elements, e.g. spring-biased pins
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the technical field of battery production, in particular, to a needle winding sleeve, a battery cell, a battery, an electrical device and a winding device.
  • the battery cell includes an electrode assembly, and the electrode assembly is formed by winding stacked pole pieces and separators around a sleeve by a winding device, and the sleeve is placed in the center hole of the electrode assembly.
  • the electrode assembly expands and contracts to squeeze the sleeve in the radial direction.
  • the support strength of the sleeve to the center hole of the electrode assembly is not enough, which may cause the electrode assembly to collapse and cause the surface of the electrode assembly to collapse. Wrinkles and lithium precipitation occur, causing potential safety hazards.
  • the application provides a needle winding sleeve, a battery cell, a battery, an electrical device, and a winding device, which can solve the problem that the electrode assembly collapses due to expansion and contraction of the electrode assembly in the prior art, resulting in wrinkles on the surface of the electrode assembly , resulting in the phenomenon of lithium precipitation, resulting in the problem of potential safety hazards.
  • the present application provides a needle roll sleeve
  • the tube wall of the needle roll sleeve is provided with a through groove through the tube wall, and the through groove extends from one end of the needle roll sleeve to the other end to allow the needle roll sleeve to The tube expands or contracts radially.
  • the through groove allows the radial expansion or contraction of the needle sleeve, so the needle sleeve has the characteristics of elastic deformation in the radial direction, and the gap formed by the through groove can indirectly reflect the radial direction of the needle sleeve. deformation amount.
  • the needle roll sleeve When the needle roll sleeve is placed in the central hole of the electrode assembly, it elastically cooperates with the electrode assembly to elastically support the electrode assembly.
  • the needle sleeve can effectively support the center hole of the electrode assembly, avoiding the collapse problem caused by insufficient support strength of the center hole of the electrode assembly.
  • the needle coil sleeve when the needle coil sleeve is squeezed during the expansion and contraction of the electrode assembly, the needle coil sleeve prevents the deformation of the electrode assembly due to its own elasticity, thereby always supporting the electrode assembly, so the surface of the electrode assembly will not Wrinkles are generated due to expansion and contraction, so the battery cell will not produce lithium precipitation, which effectively prevents safety accidents caused by the lithium precipitation phenomenon of the battery cell.
  • the through groove extends linearly along the axial direction of the needle sleeve; or, the through groove extends helically around the central axis of the needle sleeve.
  • the needle coil sleeve can be manufactured by injection molding process, so that the through groove extends linearly along the axis of the needle coil sleeve, so as to ensure the manufacturing efficiency of the needle coil sleeve and control the manufacturing cost of the needle coil sleeve;
  • the needle sleeve can elastically support the electrode assembly, and when the electrode assembly expands and contracts to squeeze the needle sleeve, due to the through groove winding
  • the central axis of the needle winding sleeve extends helically, so the needle winding sleeve can better adapt to the force exerted by the electrode assembly to deform helically in the radial direction along the direction of the central axis of the needle winding sleeve, Therefore, better elastic support is provided for the electrode assembly.
  • the tube wall of the cannula is provided with a through hole for the electrolyte to pass through.
  • through holes are provided on the tube wall of the needle winding sleeve, the electrolyte injection and infiltration efficiency of the battery cell can be further improved, and the energy density of the battery cell can be ensured.
  • the number of through holes may be one or more.
  • the multiple through holes are arranged at intervals on the needle roller sleeve.
  • the needle roller sleeve includes a first transmission part, and the first transmission part is used to cooperate with the needle roller, so that the needle roller can drive the needle roller sleeve to rotate synchronously.
  • the electrode assembly of the battery cell is formed by winding the stacked pole piece and separator around the winding needle sleeve by the winding device.
  • the first transmission part is matched with the winding needle, so that the winding needle drives the needle winding sleeve to rotate synchronously, so as to ensure the winding quality of the electrode assembly.
  • the first transmission part includes at least one locking slot, and the locking slot extends from the end surface of the needle sleeve along the axial direction of the needle sleeve.
  • the first transmission part achieves transmission cooperation with the winding needle in the form of at least one slot, which can ensure that the winding needle drives the winding needle sleeve to move synchronously, ensuring the winding quality of the electrode assembly; at the same time, when the first transmission
  • the upper part includes two or more card slots.
  • the needle has a corresponding number of protrusions to the card slots, it can ensure the stability of the connection between the needle and the needle sleeve and effectively make the winding power of the needle
  • the ground is passed to the needle sleeve to prevent the needle and the needle sleeve from slipping in the direction of rotation.
  • the winding power transmitted by the roll to the needle sleeve can act on the needle sleeve evenly, avoiding the needle sleeve from being damaged due to Due to damage caused by excessive local stress, the needle-rolling sleeve is completely placed in the electrode assembly, ensuring the elastic support of the needle-rolling sleeve to the electrode assembly.
  • the present application provides a battery cell, including an electrode assembly and a needle sleeve according to any one of the foregoing embodiments, and the needle sleeve is disposed in a central hole of the electrode assembly.
  • the battery cell includes an electrode assembly and a needle sleeve disposed in the center hole of the electrode assembly.
  • the needle sleeve can effectively support the center hole of the electrode assembly, avoiding the collapse problem caused by the insufficient support strength of the needle sleeve to the center hole of the electrode assembly.
  • the needle coil sleeve when the needle coil sleeve is squeezed during the expansion and contraction of the electrode assembly, the needle coil sleeve prevents the deformation of the electrode assembly due to its own elasticity, thereby always supporting the electrode assembly, so the surface of the electrode assembly will not Wrinkles are generated due to expansion and contraction, so the battery cell will not produce lithium precipitation, which effectively prevents safety accidents caused by the lithium precipitation phenomenon of the battery cell.
  • the present application provides a winding device, including a driving mechanism, a winding needle, and a needle winding sleeve as in any one of the foregoing embodiments, the driving mechanism is used to drive the winding needle to rotate, and the needle winding sleeve is sleeved on The needle and the needle sleeve are used to wind the stacked pole pieces and separators to form an electrode assembly.
  • the electrode assembly with the needle winding sleeve can be manufactured by the winding device.
  • the winding needle of the winding device is inserted into the needle winding sleeve, and the driving mechanism of the winding device can simultaneously drive the winding needle casing to rotate when driving the winding needle to rotate.
  • the winding needle includes a second transmission part, and the second transmission part is used to cooperate with the needle winding sleeve, so that the winding needle can drive the needle winding sleeve to rotate synchronously.
  • the second transmission part on the winding needle can effectively drive the winding needle to the winding needle sleeve, so that the winding needle drives the winding needle casing to rotate synchronously, ensuring the winding quality of the electrode assembly.
  • the winding device further includes a composite mechanism configured to composite the septum with the needle winding sleeve.
  • the diaphragm can be compounded on the peripheral surface of the needle winding sleeve through the compound mechanism, so as to ensure the winding quality of the electrode assembly.
  • FIG. 1 is a schematic diagram of a battery cell in an embodiment of the present application
  • FIG. 2 is a cross-sectional view of a battery cell in an embodiment of the present application.
  • Fig. 3 is the front view of the needle cannula in the embodiment of the present application.
  • Fig. 4 is a top view of the needle sleeve in the embodiment of the present application.
  • Fig. 5 is a cross-sectional view of the needle-rolling sleeve in the embodiment of the present application.
  • Fig. 6 is the axonometric view of the needle sleeve in the present embodiment
  • FIG. 7 is a schematic diagram of a winding device provided in an embodiment of the present application.
  • Fig. 8 is a side view of the needle sleeve in the embodiment of the present application.
  • Fig. 9 is a schematic diagram of the rolling needle in the embodiment of the present application.
  • Fig. 10 is a schematic diagram when the end surface of the needle winding sleeve in the embodiment of the present application is provided with three slots;
  • Fig. 11 is a cross-sectional view of the needle sleeve provided in Fig. 8;
  • Fig. 12 provides a schematic diagram of a needle roller that can cooperate with the needle roller sleeve provided in Fig. 8;
  • Fig. 13 is a cross-sectional view of the rolling needle provided in Fig. 12;
  • Fig. 14 provides a schematic diagram of a needle roller that can cooperate with the needle roller sleeve provided in Fig. 10;
  • Fig. 15 is a cross-sectional view of the rolling needle provided in Fig. 12;
  • Fig. 16 is a schematic diagram when the end face of the needle-rolling sleeve in the embodiment of the present application is provided with a slot;
  • Fig. 17 is a cross-sectional view of the needle sleeve provided in Fig. 16;
  • Fig. 18 provides a schematic diagram of a needle roller that can cooperate with the needle roller sleeve provided in Fig. 16;
  • Fig. 19 is a cross-sectional view of the rolling needle provided in Fig. 18;
  • Fig. 20 provides a schematic diagram of a needle roller that can cooperate with the needle roller sleeve provided in Fig. 16;
  • Fig. 21 is a cross-sectional view of the rolling needle provided in Fig. 20;
  • Fig. 22 is a schematic diagram when the end surface of the needle sleeve in the embodiment of the present application does not have a slot
  • Figure 23 is a cross-sectional view of the needle roller sleeve provided in Figure 22;
  • Figure 24 provides a schematic view of a detachable protruding needle roller
  • Figure 25 is a cross-sectional view of the rolling needle provided in Figure 24;
  • Fig. 26 is a schematic diagram of the first shape of the slot and the first shape of the protrusion in the embodiment of the present application;
  • Fig. 27 is a schematic diagram of the second shape of the card slot and the first shape of the protrusion in the embodiment of the present application;
  • Fig. 28 is a schematic diagram of the third shape of the slot and the third shape of the protrusion in the embodiment of the present application.
  • Fig. 29 is a schematic diagram of the fourth shape of the slot and the fourth shape of the protrusion in the embodiment of the present application.
  • Fig. 30 is a schematic diagram of the fifth shape of the slot and the fifth shape of the protrusion in the embodiment of the present application.
  • Fig. 31 is a schematic diagram of the sixth shape of the slot and the sixth shape of the protrusion in the embodiment of the present application.
  • Icons 100-battery unit; 10-needle sleeve; 11-through slot; 12-through hole; 13-first transmission part; 130-card slot; 131-guide slot; 1310-guide slope; Components; 21-pole piece; 22-diaphragm; 101-housing; 102-end cap; 200-winding device; 30-rolling needle; 31-second transmission part; - Composite body.
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection , can also be indirectly connected through an intermediary, and can be internal communication between two components.
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection , can also be indirectly connected through an intermediary, and can be internal communication between two components.
  • “Plurality” in this application refers to two or more (including two).
  • the battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, or sodium-lithium-ion batteries, which are not limited in the embodiments of the present application.
  • the battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in this application may include a battery module or a battery pack, and the like.
  • Batteries generally include a case for enclosing one or more battery cells. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.
  • the battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive pole piece, a negative pole piece and a separator.
  • a battery cell works primarily by moving metal ions between the positive and negative pole pieces.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, and the positive electrode collector without the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. Fluid, the positive electrode current collector not coated with the positive electrode active material layer is used as the positive electrode tab.
  • the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, and the positive electrode collector not coated with the negative electrode active material layer protrudes from the positive electrode collector coated with the negative electrode active material layer Fluid, the positive electrode current collector not coated with the negative electrode active material layer is used as the negative electrode tab.
  • the material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon.
  • the number of positive pole tabs is multiple and stacked together, and the number of negative pole tabs is multiple and stacked together.
  • the material of the isolation film may be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene).
  • the electrode assembly may be a wound structure.
  • the lithium precipitation phenomenon refers to the phenomenon that when the lithium ions deintercalated from the positive electrode of the battery cell during the charging process cannot be inserted into the negative electrode, the lithium ions can only be precipitated on the surface of the negative electrode, thereby forming a layer of gray matter.
  • the electrode assembly expands and contracts, and the needle sleeve is squeezed. If the support strength of the needle sleeve to the electrode assembly is insufficient, the electrode assembly may collapse, resulting in Wrinkles on the surface of the electrode assembly lead to lithium precipitation, which not only reduces the safety performance of the battery cell, greatly shortens the cycle life, but also limits the fast charging capacity of the battery cell, and may cause catastrophic consequences such as combustion and explosion.
  • the inventors found that since the existing needle sleeve is a round tube, the electrode assembly mainly squeezes the needle sleeve in the radial direction during the expansion and contraction process. If the existing needle roll sleeve can be improved so that it can shrink and expand uniformly when it is radially squeezed, it can adapt to the volume change during the expansion and contraction of the electrode assembly, and the collapse of the electrode assembly can be reduced possibility, thereby improving the safety performance of the battery cell.
  • the present application proposes a technical solution, wherein the needle sleeve can shrink and expand uniformly in the radial direction when being pressed radially, which can improve the safety performance of the battery cell.
  • the battery cells can directly supply power to electric devices, and can also be connected in parallel or in series to form batteries to supply power to various electric devices in the form of batteries.
  • the electric devices that use battery cells or batteries described in the embodiments of the present application can be in various forms, for example, mobile phones, portable devices, notebook computers, battery cars, electric cars, ships, spacecraft, Electric toys and electric tools, etc.
  • spacecraft include airplanes, rockets, space shuttles and spaceships, etc.
  • Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric boat toys and Electric aircraft toys, etc.
  • Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and planer.
  • the battery cells and batteries described in the embodiments of the present application are not limited to the above-described electric devices, but also applicable to all electric devices using battery cells and batteries. However, for the sake of brevity, the following embodiments All electric vehicles are taken as an example for illustration.
  • Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles.
  • the battery can be used for power supply of the vehicle, for example, the battery can be used as the operating power source of the vehicle.
  • the controller is used to control the power supplied by the battery to the motor, for example, for starting, navigating, and working power requirements of the vehicle.
  • the battery can not only be used as an operating power source for the vehicle, but can also be used as a driving power source for the vehicle, replacing or partially replacing fuel oil or natural gas to provide driving power for the vehicle.
  • the battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • a battery is formed by connecting multiple battery cells in series or in parallel.
  • FIG. 1 is a schematic diagram of a battery cell 100 in the embodiment of the present application
  • FIG. 2 is a cross-sectional view of the battery cell 100 in the embodiment of the present application.
  • the battery cell 100 includes an electrode assembly 20 , a needle sleeve 10 , a casing 101 and an end cap 102 .
  • the needle roller sleeve 10 is disposed in the central hole of the electrode assembly 20 .
  • the needle roller sleeve 10 is located in the central hole of the electrode assembly 20 to elastically support the electrode assembly 20 .
  • An accommodating chamber is formed inside the housing 101 for accommodating the electrode assembly 20 and electrolyte, and the end cap 102 closes the opening of the housing 101 to seal the electrode assembly 20 into the accommodating chamber.
  • the force exerted by the electrode assembly 20 on the needle sleeve 10 in the radial direction will cause the needle sleeve 10 to deform in the radial direction adaptively, always Elastic support for the electrode assembly 20 prevents the electrode assembly 20 from collapsing, avoids the phenomenon of lithium deposition in the battery cell 100 due to wrinkles on the surface of the electrode assembly 20, and effectively ensures the use of the battery cell 100 Safety.
  • the following describes how the needle roller sleeve 10 elastically supports the electrode assembly 20 .
  • FIG. 3 is a front view of the needle roller sleeve 10 in the embodiment of the present application.
  • the tube wall of the needle sleeve 10 is provided with a through groove 11 penetrating through the tube wall, and the through slot 11 extends from one end of the needle sleeve 10 to the other end to allow the needle sleeve 10 to expand or contract radially.
  • the through groove 11 allows the needle roll sleeve 10 to expand or contract in the radial direction, so the needle roll sleeve 10 has the characteristic of elastic deformation in the radial direction, and the gap formed by the through groove 11 can be indirectly regarded as the needle roll sleeve.
  • the force exerted by the electrode assembly 20 on the needle sleeve 10 in the radial direction will cause the needle sleeve 10 to deform in the radial direction adaptively, so that Effective support is provided to the center of the electrode assembly 20 .
  • the needle sleeve 10 is deformed accordingly due to its own elasticity to prevent the deformation of the electrode assembly 20, so that the center of the electrode assembly 20 is always aligned.
  • the pores are supported, so the surface of the electrode assembly 20 will not wrinkle due to expansion and contraction, so the battery cell 100 will not produce lithium precipitation, effectively preventing safety accidents caused by the battery cell 100 due to lithium precipitation.
  • electrolyte solution will be injected into the electrode assembly 20 .
  • the electrolyte is the carrier of ion transport in the battery.
  • the electrolyte plays the role of conducting ions between the positive and negative electrodes of the battery.
  • the needle sleeve 10 is in direct contact with the electrode assembly 20, and the through groove 11 on the needle sleeve 10 can conduct the inside of the needle sleeve 10 with the electrode assembly 20, so a channel is reserved for electrolyte injection and infiltration , thereby effectively improving the electrolyte injection and wetting effects, and increasing the energy density of the battery cell 100 .
  • the needle cannula 10 can be made of insulating material, or can be provided with an insulating material on its surface.
  • the through groove 11 extends linearly along the axial direction of the needle sleeve 10, that is to say, the direction of the needle sleeve 10 along the through groove 11 is perpendicular to the direction of the through groove 11.
  • the unfolded shape of the needle roller sleeve 10 is a rectangle.
  • the needle roll sleeve 10 can be manufactured through a simple process, such as injection molding, so that the through groove 11 extends linearly along the axis of the needle roll sleeve 10, so as to ensure the manufacturing efficiency of the needle roll sleeve 10 and control the needle roll sleeve 10 manufacturing cost.
  • the linear through groove 11 may extend obliquely to the axial direction of the needle sleeve 10 , that is, the needle sleeve 10 extends along the through groove 11 perpendicular to the extending direction of the through groove 11 .
  • the unfolded shape of the needle cannula 10 is a parallelogram with two adjacent edges inclined to each other.
  • the through groove 11 extends helically around the central axis of the needle cannula 10 . That is to say, the needle cannula 10 can be regarded as a strip formed by helically winding along the extension direction of the central axis of the needle cannula 10 with the central axis of the needle cannula 10 as the rotation axis.
  • the needle sleeve 10 When the through groove 11 is designed to extend helically around the central axis of the needle sleeve 10, the needle sleeve 10 can better elastically support the electrode assembly 20, and the expansion and contraction of the electrode assembly 20 will affect the needle sleeve 10.
  • the needle sleeve 10 can better adapt to the force exerted by the electrode assembly 20 and along the central axis of the needle sleeve 10.
  • the direction is helically deformed in the radial direction, so as to provide better elastic support for the electrode assembly 20 .
  • the through groove 11 is in a spiral shape, the inside of the needle sleeve 10 and the electrode assembly 20 have a large area of conduction, which can effectively improve the electrolyte injection and infiltration effects, and improve the energy density of the battery cell 100 .
  • Figure 4 is a top view of the needle winding sleeve 10 in the embodiment of the application
  • Figure 5 is a cross-sectional view of the needle winding sleeve 10 in the embodiment of the application
  • Figure 6 is the needle winding sleeve 10 in the embodiment of the present application Axonometric view of bushing 10.
  • a through hole 12 through which the electrolyte solution passes is provided on the tube wall of the needle roll sleeve 10 .
  • the through hole 12 can effectively conduct the inside of the needle cannula 10 and the electrode assembly 20 .
  • the electrolyte injection and wetting efficiency of the battery cell 100 can be further improved, and the energy density of the battery cell 100 can be ensured.
  • the number of through holes 12 may be one or more. When there are multiple through holes 12 , the multiple through holes 12 are arranged at intervals on the needle sleeve 10 .
  • a plurality of through holes 12 are provided in both the axial direction and the radial direction of the needle roller sleeve 10 .
  • a plurality of through holes 12 on the same straight line are defined as a row of through holes 12 in units of columns, see Figure 5, the needle sleeve 10
  • the electrolyte injection and infiltration efficiency of the battery cell 100 can be effectively improved, and the energy density of the battery cell 100 can be ensured; at the same time, the three columns of through holes 12 are designed as
  • the needle sleeves 10 are evenly spaced based on the central axis, so that the needle sleeves 10 are evenly stressed when being squeezed by the electrode assembly 20 , ensuring elastic support of the electrode assembly 20 by the needle sleeves 10 .
  • the needle winding sleeve 10 of the battery cell 100 can not only improve the safety performance and energy density of the battery cell 100, but also reduce the pressure of the winding needle and the needle winding sleeve 10 during the winding and forming process of the electrode assembly 20.
  • the assembly accuracy is improved, the winding quality of the electrode assembly 20 is improved, and the electrode assembly 20 has better straightness of the winding axis.
  • the winding device will be described below.
  • FIG. 7 is a schematic diagram of a winding device 200 provided in an embodiment of the present application.
  • the winding device 200 comprises a drive mechanism (not shown in the figures), a winding needle 30 and the needle winding sleeve 10 described above (not shown in FIG. 6 ).
  • the driving mechanism is used to drive the winding needle 30 to rotate, the needle winding sleeve 10 is sleeved on the winding needle 30 , and the needle winding sleeve 10 is used to wind the stacked pole piece 21 and the separator 22 to form the electrode assembly 20 .
  • the needle roller sleeve 10 is provided with a through groove 11, so it has elasticity in the radial direction.
  • the elasticity of the needle sleeve 10 can allow the needle 30 to be smoothly inserted into the needle sleeve 10 to drive the needle sleeve 10 to rotate , can effectively reduce the manufacturing cost of the needle roller sleeve 10 and the needle roller 30 .
  • the matching gap between the inner wall of the needle sleeve 10 and the outer surface of the needle 30 is relatively small, the bouncing and bending phenomena of the needle sleeve 10 during rotation can also be alleviated, so that the electrode assembly 20 has a better performance.
  • the straightness of the winding axis improves the winding quality of the electrode assembly 20 .
  • the winding needle 30 can be made of tungsten steel or alloy steel and other materials with high hardness and wear resistance, so as to ensure that the winding needle 30 can stably and effectively drive the winding needle sleeve 10 to rotate.
  • the winding device 200 further includes a recombination mechanism 40 for recombining the septum 22 with the needle cannula 10 .
  • the composite mechanism 40 includes but is not limited to a gluing machine, a blanching mechanism, a pressing roller mechanism or a crochet mechanism. Before winding, the composite mechanism 40 can glue, heat, press the head of the diaphragm 22 or wrap it on the On the needle sleeve 10.
  • the driving mechanism of the winding device 200 works, the needle winding sleeve 10 rotates, and the stacked pole piece 21 and the diaphragm 22 are wound around the needle winding sleeve 10. pull out.
  • FIG. 8 is a side view of the needle roller sleeve 10 in the embodiment of the present application
  • FIG. 9 is a schematic diagram of the needle roller 30 in the embodiment of the present application.
  • the needle roller sleeve 10 includes a first transmission part 13 .
  • the needle roller 30 includes a second transmission part 31 .
  • the first transmission portion 13 of the needle winding sleeve 10 cooperates with the second transmission portion 31 of the winding needle 30 so that the winding needle 30 can drive the needle winding sleeve 10 to rotate synchronously.
  • the first transmission part 13 and the second transmission part 31 cooperate with each other, it can ensure that the winding needle 30 drives the needle winding sleeve 10 to rotate synchronously, thereby ensuring the winding efficiency of the winding needle 30 device and the winding quality of the electrode assembly 20 .
  • the first transmission part 13 includes at least one locking groove 130 , and the locking groove 130 extends from the end surface of the needle roller sleeve 10 along the axial direction of the needle roller sleeve 10 .
  • the second transmission part 31 may include a protrusion 310 which can be embedded in the engaging groove 130 to realize synchronous transmission of the needle sleeve 10 .
  • the first transmission part 13 achieves transmission cooperation with the winding needle 30 in the form of at least one locking groove 130, which can ensure that the winding needle 30 drives the winding needle sleeve 10 to move synchronously, and ensures the winding quality of the electrode assembly 20; at the same time, when the first transmission
  • the part 13 includes two or more locking grooves 130.
  • the winding needle 30 has a corresponding number of protrusions 310 to the locking grooves 130, the stability of the connection between the rolling needle 30 and the winding needle sleeve 10 can be ensured, and The winding power of the needle winding 30 can be effectively transmitted to the needle winding sleeve 10 to prevent the slipping of the winding needle 30 and the needle winding sleeve 10 in the direction of rotation.
  • the first transmission part 13 includes two or more locking grooves 130
  • Fig. 10 is a schematic diagram of the end surface of the needle roller sleeve 10 in the embodiment of the present application when there are three slots 130, and Fig. 11 is provided in Fig. 10 Cross-sectional view of the needle cannula 10. It can be seen from Fig. 10 and Fig. 11 that on the end face of the needle sleeve 10, three clamping grooves 130 and through grooves 11 are evenly arranged with the central axis of the needle sleeve 10 as the reference interval, so as to ensure the structure of the needle sleeve 10 Stability.
  • the winding needle 30 has an equal number of protrusions 310 corresponding to the slots 130 one by one, it can ensure that the winding needle 30 smoothly drives the needle winding sleeve 10 to rotate synchronously.
  • FIG. 12 provides a schematic diagram of a needle roller 30 that can cooperate with the needle roller sleeve 10 provided in FIG. 10
  • FIG. 13 is a cross-sectional view of the needle roller 30 provided in FIG. 12
  • the rolling needle 30 is provided with four protrusions 310, and the four protrusions 310 are evenly spaced based on the central axis of the rolling needle 30.
  • the four protrusions 310 can be embedded in the three card slots 130 and the through slot 11 respectively. To smoothly drive the needle roll sleeve 10 to rotate synchronously.
  • FIG. 14 provides a schematic diagram of a needle roller 30 that can cooperate with the needle roller sleeve 10 provided in FIG. 10
  • FIG. 15 is a cross-sectional view of the needle roller 30 provided in FIG. 12 .
  • Three protrusions 310 are arranged on the needle 30, and the three protrusions 310 are in one-to-one correspondence with the three slots 130, so that each protrusion 310 is embedded in the corresponding slot 130 to smoothly drive the needle sleeve 10 rotate synchronously.
  • Fig. 16 is a schematic diagram of the end surface of the needle roll sleeve 10 in the embodiment of the present application having a slot 130
  • Fig. 17 is the roll provided in Fig. 16 Cross-sectional view of needle cannula 10
  • one end surface of the needle roller sleeve 10 is provided with a locking groove 130
  • the locking grooves 130 and the through grooves 11 are evenly arranged with the central axis of the needle sleeve 10 as a reference.
  • FIG. 18 provides a schematic diagram of a needle roller 30 that can cooperate with the needle roller sleeve 10 provided in FIG. 16
  • FIG. 19 is a cross-sectional view of the needle roller 30 provided in FIG. 18
  • Two protrusions 310 are arranged on the rolling needle 30, and the two protrusions 310 are evenly spaced based on the central axis of the rolling needle 30.
  • the two protrusions 310 can be embedded in the card groove 130 and the through groove 11 respectively, so as to stabilize
  • the ground drives the needle roll sleeve 10 to rotate synchronously.
  • FIG. 20 provides a schematic diagram of a needle roller 30 that can cooperate with the needle roller sleeve 10 provided in FIG. 16
  • FIG. 21 is a cross-sectional view of the needle roller 30 provided in FIG. 20
  • a protrusion 310 is provided on the winding needle 30 , and the protrusion 310 can be embedded in the slot 130 to smoothly drive the needle winding sleeve 10 to rotate synchronously.
  • FIG. 22 is a schematic diagram of the end surface of the needle roll sleeve 10 in the embodiment of the present application without the slot 130.
  • FIG. 23 is the roll provided in FIG. 22. Cross-sectional view of needle cannula 10 .
  • Needle sleeve 10 may not be provided with a card slot 130, the first transmission part 13 may include a through groove 11, and the protrusion 310 on the needle roll 30 can be embedded in the through groove 11, and the needle roll 30 can also drive the needle sleeve 10 to be synchronized sports.
  • the locking groove 130 is not provided on the needle roller sleeve 10 , the manufacturing difficulty and manufacturing cost of the needle roller sleeve 10 can be reduced.
  • the rolling needle 30 provided in FIG. 18 can cooperate with the needle rolling sleeve 10 provided in FIG. Synchronized rotation.
  • the protrusion 310 on the roller needle 30 can be embedded in the slot 130 and the through slot 11 , or only embedded in one of the slot 130 or the slot 11 .
  • the locking groove 130 can extend to the end surface of the needle roller sleeve 10 through the guiding groove 131, the guiding groove 131 has two opposite guiding slopes 1310, and the two guiding slopes 1310 are along the direction from the guiding groove 131 to the locking groove 130 Close to each other, so that when the needle 30 is inserted into the needle sleeve 10 , the protrusion 310 on the needle 30 can be smoothly embedded in the slot 130 along any one of the guide slopes 1310 .
  • the end of the through groove 11 can also be provided with a guide groove 131, so that the protrusion 310 on the rolling needle 30 can follow any guiding slope 1310 is smoothly embedded in the through groove 11 .
  • the protrusion 310 can be detachably connected to the winding needle 30 through an intermediate piece.
  • the projection 310 is designed to be detachably connected to the needle winding needle 30, so that the maintenance projection 310 can be replaced in time, ensuring that the winding needle 30 smoothly drives the needle winding sleeve 10 to rotate.
  • FIG. 24 provides a schematic diagram of a needle roller 30 with detachable protrusions 310 .
  • FIG. 25 is a cross-sectional view of the needle roller 30 provided in FIG. 24 .
  • the intermediate piece includes a ring 311 , which is arranged coaxially with the winding needle 30 , and the setting ring 311 is slidably sleeved on the winding needle 30 .
  • the protrusion 310 is formed on the end surface of the ring 311 and extends along the axial direction of the needle roller 30 .
  • the ring 311 can be formed with a corresponding number of protrusions 310, for example, the ring 311 can be formed with one, two, three or four 310 and so on.
  • the embodiment of the present application does not limit the shape of the slot 130 and the shape of the protrusion 310, so as to realize the transmission cooperation between the slot 130 and the protrusion 310, and ensure that the winding needle 30 smoothly drives the needle winding sleeve 10 turns.
  • FIG. 26 is a schematic view of the first shape of the slot 130 and the first shape of the protrusion on the ring 311 in the embodiment of the present application.
  • the locking groove 130 has a round head and parallel shape, that is, the end of the locking groove 130 is semicircular, and the two opposite wall surfaces of the locking groove 130 are parallel to each other.
  • the protrusion 310 is also rounded and parallel, that is, the end of the protrusion 310 is semicircular, and the two opposite surfaces of the protrusion 310 are parallel to each other, so as to fit into the slot 130 .
  • FIG. 27 is a schematic diagram of the second shape of the slot 130 and the second shape of the protrusion on the ring 311 in the embodiment of the present application.
  • the card slot 130 is square.
  • the protrusion 310 is also in the shape of a square, so as to fit into the slot 130 .
  • FIG. 28 is a schematic diagram of the third shape of the slot 130 and the third shape of the protrusion on the ring 311 in the embodiment of the present application.
  • the slot 130 is in the shape of a triangular arc, that is, the end of the slot 130 is arc-shaped.
  • the protrusion 310 is also in the shape of a triangular arc, that is, the end of the protrusion 310 is arc-shaped, and the two opposite surfaces of the protrusion 310 are inclined to each other and are transitionally connected by the end of the protrusion 310 to engage with the slot 130 .
  • FIG. 29 is a schematic view of the fourth shape of the slot 130 and the fourth shape of the protrusion on the ring 311 in the embodiment of the present application.
  • the locking groove 130 is in a parallel arc shape, that is, the end of the locking groove 130 is arc-shaped, and the two opposite wall surfaces of the locking groove 130 are parallel to each other.
  • the protrusions 310 are also arc-shaped in parallel, that is, the ends of the protrusions 310 are arc-shaped, and the two opposite surfaces of the protrusions 310 are parallel to each other so as to engage with the slot 130 .
  • FIG. 30 is a schematic diagram of the fifth shape of the slot 130 and the fifth shape of the protrusion on the ring 311 in the embodiment of the present application.
  • the slot 130 is in the shape of a triangular point, that is, the two opposite walls of the slot 130 are inclined to each other and extend to the end of the slot 130 .
  • the protrusion 310 is also in the shape of a triangular point, that is, the two opposite surfaces of the protrusion 310 are inclined to each other and extend to the end of the protrusion 310 to engage with the engaging groove 130 .
  • FIG. 31 is a schematic diagram of the sixth shape of the slot 130 and the sixth shape of the protrusion on the ring 311 in the embodiment of the present application.
  • the card slot 130 is in the shape of a semicircle.
  • the ends of the protrusions 310 are also semicircular for engaging with the slots 130 .

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Abstract

本申请公开一种卷针套管、电池单体、电池、用电装置和卷绕装置。卷针套管的管壁上设有贯穿管壁的通槽，通槽从卷针套管的一端延伸至另一端，以容许卷针套管沿径向扩张或收缩。本申请提供的技术方案能够解决现有技术中电极组件因膨胀和收缩，使得电极组件坍塌，导致电极组件表面产生褶皱，产生析锂现象，造成安全隐患的问题。

Description

卷针套管、电池单体、电池、用电装置和卷绕装置
相关申请的交叉引用
本申请要求享有于2021年07月30日提交的名称为“卷针套管、电池单体、电池、用电装置和卷绕装置”的中国专利申请202121772542.2的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请涉及电池生产技术领域，具体而言，涉及一种卷针套管、电池单体、电池、用电装置和卷绕装置。
背景技术
电池单体包括电极组件，电极组件通过卷绕装置将层叠设置的极片和隔膜绕套管卷绕形成，套管置留于电极组件中心孔内。
电池单体在充放电过程中，电极组件发生膨胀和收缩，以沿径向对套管进行挤压，套管对电极组件中心孔的支撑强度不够，可能会导致电极组件坍塌，导致电极组件表面产生褶皱，产生析锂现象，造成安全隐患。
发明内容
本申请提供了一种卷针套管、电池单体、电池、用电装置和卷绕装置，其能够解决现有技术中电极组件因膨胀和收缩，使得电极组件坍塌，导致电极组件表面产生褶皱，产生析锂现象，造成安全隐患的问题。
第一方面，本申请提供一种卷针套管，卷针套管的管壁上设有贯穿管壁的通槽，通槽从卷针套管的一端延伸至另一端，以容许卷针套管沿径向扩张或收缩。
上述实现的过程中，通槽容许卷针套管沿径向扩张或收缩，故卷针套管具备沿径向弹性形变的特征，且通槽形成的间隙可间接反映卷针套管在径向上的形变量。卷针套管置留于电极组件的中心孔时，与电极组件弹性配合，对电极组件进行弹性支撑。当电池单体因充放电导致电极组件膨胀和收缩时，卷针套管能够有效地对电极组件的中心孔支撑，避免因电极组件中心孔支撑强度不足导致的坍塌问题。具体而言，电极组件膨胀和收缩过程中挤压卷针套管时，卷针套管因自身弹性的原因，制止电极组件的形变，从而始终对电极组件进行支撑，故电极组件的表面不会因膨胀收缩而产生褶皱，因此电池单体不会产生析锂现象，有效地防止电池单体因析锂现象导致的安全事故发生。
在可选的实施方式中，通槽沿卷针套管的轴向呈直线延伸；或，通槽绕卷针套管的中心轴线呈螺旋延伸。
上述实现的过程中，卷针套管可通过注塑工艺制造，使得通槽沿卷针套管的轴线呈直线延伸，保证卷针套管的制造效率和控制卷针套管的制造成本；当通槽设计为绕卷针套管的中心轴线呈螺旋延伸时，卷针套管能够较好地对电极组件弹性支撑，且电极组件膨胀和收缩对卷针套管进行挤压时，由于通槽绕卷针套管的中心轴线呈螺旋延伸，故卷针套管能够较好地适应电极组件施加的作用力以沿着卷针套管的中心轴线的方向上呈螺旋状地在径向上进行形变，从而对电极组件提供较好的弹性支撑。
在可选的实施方式中，卷针套管的管壁上设有供电解液通过的通孔。
上述实现的过程中，通过在卷针套管的管壁上设置通孔，能够进一步地提高电池单体的电解液注液和浸润效率，保证电池单体的能量密度。需要说明的是，通孔的数量可以为一个或者多个。当通孔的数量为多个时，多个通孔在卷针套管上间隔布设。
在可选的实施方式中，卷针套管包括第一传动部，第一传动部用于与卷针配合，以使卷针能 够带动卷针套管同步转动。
上述实现的过程中，电池单体的电极组件通过卷绕装置将层叠设置的极片和隔膜绕卷针套管卷绕形成。通过在卷针套管设置第一传动部，使得第一传动部与卷针传动配合，从而使得卷针带动卷针套管同步转动，保证电极组件的卷绕质量。
在可选的实施方式中，第一传动部包括至少一个卡槽，卡槽从卷针套管的端面沿卷针套管的轴向延伸。
上述实现的过程中，第一传动部以至少一个卡槽的方式与卷针实现传动配合，能保证卷针带动卷针套管同步运动，保证电极组件的卷绕质量；同时，当第一传动部包括两个或两个以上数量的卡槽，卷针具备与卡槽相应数量的凸起时，能够保证卷针和卷针套管之间的连接稳定性以及将卷针的卷绕动力有效地传递给卷针套管，防止卷针和卷针套管在转动方向上出现打滑的情况。
在可选的实施方式中，卡槽的数量为多个，多个卡槽围绕卷针套管的中心轴线间隔分布。
上述实现的过程中，因多个卡槽围绕卷针套管的中心轴线间隔分布，故卷针对卷针套管传递的卷绕动力能够均匀作用于卷针套管上，避免卷针套管因局部应力过大而造成的损坏，使得卷针套管完整地置留于电极组件中，保证了卷针套管对电极组件的弹性支撑。
第二方面，本申请提供一种电池单体，包括电极组件和如前述实施方式任一项的卷针套管，卷针套管设置于电极组件的中心孔内。
上述实现的过程中，电池单体包括电极组件和设置在电极组件中心孔内的卷针套管。当电池单体因充放电导致电极组件膨胀和收缩时，卷针套管能够有效地对电极组件的中心孔支撑，避免因卷针套管对电极组件中心孔支撑强度不足导致的坍塌问题。具体而言，电极组件膨胀和收缩过程中挤压卷针套管时，卷针套管因自身弹性的原因，制止电极组件的形变，从而始终对电极组件进行支撑，故电极组件的表面不会因膨胀收缩而产生褶皱，因此电池单体不会产生析锂现象，有效地防止电池单体因析锂现象导致的安全事故发生。
第三方面，本申请提供一种卷绕装置，包括驱动机构、卷针和如前述实施方式中任一项的卷针套管，驱动机构用于驱动卷针转动，卷针套管套接于卷针，卷针套管用于卷绕层叠设置的极片和隔膜以形成电极组件。
上述实现的过程中，通过卷绕装置能够制造具备卷针套管的电极组件。卷绕装置的卷针插接于卷针套管内，且卷绕装置的驱动机构在驱动卷针转动时，能够同时带动卷针套管转动。
在可选的实施方式中，卷针包括第二传动部，第二传动部用于与卷针套管配合，以使卷针能够带动卷针套管同步转动。
上述实现的过程中，通过在卷针上的第二传动部，能够使得卷针有效地与卷针套管传动连接，使得卷针带动卷针套管同步转动，保证电极组件的卷绕质量。
在可选的实施方式中，卷绕装置还包括配置有复合机构，用于将隔膜复合于卷针套管。
上述实现的过程中，通过复合机构，能够将隔膜复合于卷针套管的周面，以保证电极组件的卷绕质量。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，应当理解，以下附图仅示出了本申请的某些实施例，因此不应被看作是对范围的限定，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他相关的附图。
图1为本申请实施例中电池单体的示意图；
图2为本申请实施例中电池单体的截面图；
图3为本申请实施例中卷针套管的前视图；
图4为本申请实施例中卷针套管的俯视图；
图5为本申请实施例中卷针套管的截面图；
图6为本实施例中卷针套管的轴测图；
图7为本申请实施例提供的卷绕装置的示意图；
图8为本申请实施例中卷针套管的侧视图；
图9为本申请实施例中卷针的示意图；
图10为本申请实施例中卷针套管的端面具备三个卡槽时的示意图；
图11为图8所提供的卷针套管的截面图；
图12提供一种能够与图8提供的卷针套管配合的卷针的示意图；
图13为图12所提供的卷针的截面图；
图14提供一种能够与图10提供的卷针套管配合的卷针的示意图；
图15为图12所提供的卷针的截面图；
图16为本申请实施例中卷针套管的端面具备一个卡槽时的示意图；
图17为图16所提供的卷针套管的截面图；
图18提供一种能够与图16提供的卷针套管配合的卷针的示意图；
图19为图18所提供的卷针的截面图；
图20提供一种能够与图16提供的卷针套管配合的卷针的示意图；
图21为图20所提供的卷针的截面图；
图22为本申请实施例中卷针套管的端面不具备卡槽时的示意图；
图23为图22所提供的卷针套管的截面图；
图24提供了一种凸起可拆离的卷针的示意图；
图25为图24所提供的卷针的截面图；
图26为本申请实施例中卡槽的第一种形状和凸起的第一种形状的示意图；
图27为本申请实施例中卡槽的第二种形状和凸起的第人种形状的示意图；
图28为本申请实施例中卡槽的第三种形状和凸起的第三种形状的示意图；
图29为本申请实施例中卡槽的第四种形状和凸起的第四种形状的示意图；
图30为本申请实施例中卡槽的第五种形状和凸起的第五种形状的示意图；
图31为本申请实施例中卡槽的第六种形状和凸起的第六种形状的示意图。
图标：100-电池单体；10-卷针套管；11-通槽；12-通孔；13-第一传动部；130-卡槽；131-导向槽；1310-导向斜面；20-电极组件；21-极片；22-隔膜；101-壳体；102-端盖；200-卷绕装置；30-卷针；31-第二传动部；310-凸起；311-镶环；40-复合机构。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
除非另有定义，本申请所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员 通常理解的含义相同；本申请中在申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含。
在本申请中提及“实施例”意味着结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本申请所描述的实施例可以与其它实施例相结合。
在本申请的描述中需要说明的是除非另有明确的规定和限定术语“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
本申请中出现的“多个”指的是两个以上(包括两个)。
本申请中，电池单体可以包括锂离子二次电池、锂离子一次电池、锂硫电池或钠锂离子电池等，本申请实施例对此并不限定。
本申请的实施例所提到的电池是指包括一个或多个电池单体以提供更高的电压和容量的单一的物理模块。例如，本申请中所提到的电池可以包括电池模块或电池包等。电池一般包括用于封装一个或多个电池单体的箱体。箱体可以避免液体或其他异物影响电池单体的充电或放电。
电池单体包括电极组件和电解液，电极组件由正极极片、负极极片和隔离膜组成。电池单体主要依靠金属离子在正极极片和负极极片之间移动来工作。正极极片包括正极集流体和正极活性物质层，正极活性物质层涂覆于正极集流体的表面，未涂敷正极活性物质层的正极集流体凸出于已涂覆正极活性物质层的正极集流体，未涂敷正极活性物质层的正极集流体作为正极极耳。以锂离子电池为例，正极集流体的材料可以为铝，正极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。负极极片包括负极集流体和负极活性物质层，负极活性物质层涂覆于负极集流体的表面，未涂敷负极活性物质层的正极集流体凸出于已涂覆负极活性物质层的正极集流体，未涂敷负极活性物质层的正极集流体作为负极极耳。负极集流体的材料可以为铜，负极活性物质可以为碳或硅等。为了保证通过大电流而不发生熔断，正极极耳的数量为多个且层叠在一起，负极极耳的数量为多个且层叠在一起。隔离膜的材质可以为PP(polypropylene，聚丙烯)或PE(polyethylene，聚乙烯)等。此外，电极组件可以是卷绕式结构。
可以理解的是，析锂现象指的是，电池单体在充电过程中从正极脱嵌的锂离子无法嵌入负极时，锂离子就只能析出在负极表面，从而形成一层灰色物质的现象。
相关技术中，电池单体在充放电过程中，电极组件发生膨胀和收缩，对卷针套管进行挤压，若卷针套管对电极组件的支撑强度不足，可能会导致电极组件坍塌，导致电极组件表面产生褶皱，产生析锂现象，不仅使电池单体的安全性能下降，循环寿命大幅缩短，还限制了电池单体的快充容量，并有可能引起燃烧、爆炸等灾难性后果。
发明人发现，由于现有的卷针套管为圆管，电极组件膨胀和收缩过程中主要沿径向对卷针套管进行挤压。如果能够对现有的卷针套管作出改进，使其在受到径向挤压时能够均匀径向收缩和膨胀，则可以适应电极组件膨胀和收缩过程中的体积变化，则可以降低电极组件坍塌的可能性，从而提高电池单体的安全性能。
基于上述方案，本申请提出一种技术方案，卷针套管在受到径向挤压时能够均匀径向收缩和膨胀，能够提高电池单体的安全性能。下面将结合附图，对本申请中的技术方案进行描述。
可以理解的是，电池单体可以直接对用电装置供电，也可以通过并联或者串联的方式形成电池，以电池的形式对各种用电装置供电。
可以理解的是，本申请实施例中描述的使用电池单体或者电池所适用的用电装置可以为多种形式，例如，手机、便携式设备、笔记本电脑、电瓶车、电动汽车、轮船、航天器、电动玩具和电动工具等等，例如，航天器包括飞机、火箭、航天飞机和宇宙飞船等等，电动玩具包括固定式或移 动式的电动玩具，例如，游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等等，电动工具包括金属切削电动工具、研磨电动工具、装配电动工具和铁道用电动工具，例如，电钻、电动砂轮机、电动扳手、电动螺丝刀、电锤、冲击电钻、混凝土振动器和电刨。
本申请的实施例描述的电池单体以及电池不仅仅局限适用于上述所描述的用电装置，还可以适用于所有使用电池单体以及电池的用电装置，但为描述简洁，下述实施例均以电动汽车为例进行说明。
车辆的内部设置有电池、控制器和马达，例如，在车辆的底部或车头或车尾可以设置电池。车辆可以为燃油汽车、燃气汽车或新能源汽车，新能源汽车可以是纯电动汽车、混合动力汽车或增程式汽车等。
在本申请的一些实施例中，电池可以用于车辆的供电，例如，电池可以作为车辆的操作电源。控制器用来控制电池为马达的供电，例如，用于车辆的启动、导航和行驶时的工作用电需求。
在其他实施例中，电池不仅仅可以作为车辆的操作电源，还可以作为车辆的驱动电源，替代或部分地替代燃油或天然气为车辆提供驱动动力。
其中，本申请的实施例所提到的电池是指包括一个或多个电池单体以提供更高的电压和容量的单一的物理模块。例如，电池由多个电池单体串联或者并联而成。
参见图1和图2，图1为本申请实施例中电池单体100的示意图，图2为本申请实施例中电池单体100的截面图。
电池单体100包括电极组件20、卷针套管10、壳体101以及端盖102。卷针套管10设置于电极组件20的中心孔内。卷针套管10处于电极组件20的中心孔，对电极组件20进行弹性支撑。壳体101的内部形成容纳腔，用于容纳电极组件20和电解液，端盖102封闭壳体101的开口，将电极组件20封闭与容纳腔内。
当电池单体100因充放电导致电极组件20膨胀和收缩时，电极组件20沿径向对卷针套管10施加的作用力会使得卷针套管10适应性地在径向上发生形变，始终对电极组件20弹性支撑，使得电极组件20不会发生坍塌的情况，避免因电极组件20的表面产生褶皱而导致电池单体100产生析锂现象的情况发生，有效地保证电池单体100的使用安全。
下文对卷针套管10如何对电极组件20进行弹性支撑进行说明。
请参见图3，图3为本申请实施例中卷针套管10的前视图。
卷针套管10的管壁上设有贯穿管壁的通槽11，通槽11从卷针套管10的一端延伸至另一端，以容许卷针套管10沿径向扩张或收缩。
上述实现的过程中，通槽11容许卷针套管10沿径向扩张或收缩，故卷针套管10具备沿径向弹性形变的特征，且通槽11形成的间隙可间接看作卷针套管10在径向上的形变量。卷针套管10置留于电极组件20的中心孔时，与电极组件20弹性配合，对电极组件20进行弹性支撑。当电池单体100因充放电导致电极组件20膨胀和收缩时，电极组件20沿径向对卷针套管10施加的作用力会使得卷针套管10适应性地在径向上发生形变，以对电极组件20的中心提供有效地支撑。具体而言，电极组件20膨胀和收缩挤压卷针套管10时，卷针套管10因自身弹性的原因，发生相应的形变以制止电极组件20的形变，从而始终对电极组件20的中心孔进行支撑，故电极组件20的表面不会因膨胀收缩而产生褶皱，因此电池单体100不会产生析锂现象，有效地防止电池单体100因析锂现象导致的安全事故发生。
同时，需要说明的是，在电池单体100的制造过程中，会向电极组件20注入电解液。电解液是电池中离子传输的载体。电解液在电池正、负极之间起到传导离子的作用。卷针套管10与电极组件20直接接触，卷针套管10上的通槽11能够将卷针套管10的内部与电极组件20导通，因此为电解液注液和浸润预留了通道，从而有效地提高电解液的注液和浸润效果，提高了电池单体100的能量密度。同时，可以理解的是，为了减少卷针套管10将电极组件20与其他部件短接的可能性，卷针套管10可采用绝缘材质制成，或表面设置有绝缘材质。
如图3，在本申请的一些实施例中，通槽11沿卷针套管10的轴向呈直线延伸，也就是说，将卷针套管10沿通槽11向垂直于通槽11的延伸方向往两侧展开使得卷针套管10呈平面状时，卷针套管10的展开形状为矩形。
卷针套管10可通过简单地加工工艺制造，比如注塑等工艺，使得通槽11沿卷针套管10的轴线呈直线延伸，保证卷针套管10的制造效率和控制卷针套管10的制造成本。
在其他实施例中，呈直线状的通槽11可倾斜于卷针套管10的轴向延伸，也就是说，将卷针套管10沿通槽11向垂直于通槽11的延伸方向往两侧展开使得卷针套管10呈平面状时，卷针套管10的展开形状为相邻的两条边缘相互倾斜设置的平行四边形。
在本申请的另一些实施例中，通槽11绕卷针套管10的中心轴线呈螺旋延伸。也就是说，卷针套管10可看作一个条状体以卷针套管10的中心轴线为旋转轴线沿着卷针套管10的中心轴线的延伸方向呈螺旋卷绕形成。
当通槽11设计为绕卷针套管10的中心轴线呈螺旋延伸时，卷针套管10能够较好地对电极组件20弹性支撑，且电极组件20膨胀和收缩对卷针套管10进行挤压时，由于通槽11绕卷针套管10的中心轴线呈螺旋延伸，故卷针套管10能够较好地适应电极组件20施加的作用力且沿着卷针套管10的中心轴线的方向上呈螺旋状地在径向上进行形变，以对电极组件20提供较好的弹性支撑。同时，由于通槽11呈螺旋状，故卷针套管10内部与电极组件20导通的面积较大，能够有效地提高电解液的注液和浸润效果，提高了电池单体100的能量密度。
请结合图4-图6，图4为本申请实施例中卷针套管10的俯视图，图5为本申请实施例中卷针套管10的截面图，图6为本实施例中卷针套管10的轴测图。
卷针套管10的管壁上设有供电解液通过的通孔12。通孔12能够有效地导通卷针套管10的内部和电极组件20。
通过在卷针套管10的管壁上设置通孔12，能够进一步地提高电池单体100的电解液注液和浸润效率，保证电池单体100的能量密度。
需要说明的是，通孔12的数量可以为一个或者多个。当通孔12的数量为多个时，多个通孔12在卷针套管10上间隔布设。
需要说明的是，本申请实施例中，在卷针套管10的轴向和径向上均设置有多个通孔12。参照图4和图6，在卷针套管10的轴向上，以列为单位，将处于同一条直线的多个通孔12定义为一列通孔12，参见图5，卷针套管10具有三列通孔12，三列通孔12以卷针套管10的中心轴线为基准间隔均匀布设。
上述实现的过程中，通过布设多个通孔12，能够有效地提高电池单体100的电解液注液和浸润效率，保证电池单体100的能量密度；同时，将三列通孔12设计为以卷针套管10的中心轴线为基准间隔均匀布设，能够使得卷针套管10在受电极组件20的挤压时受力均匀，保证卷针套管10对电极组件20的弹性支撑。
在上述方案中，电池单体100的卷针套管10不仅可以提高电池单体100的安全性能和能量密度，还能够在电极组件20卷绕成型的过程中降低卷针与卷针套管10的装配精度，提高电极组件20的卷绕质量，使电极组件20具有较好的卷绕轴线直线度。下文将对卷绕装置进行描述。
请参见图7，图7为本申请实施例提供的卷绕装置200的示意图。卷绕装置200包括驱动机构(在附图中未示出)、卷针30和上文描述的卷针套管10(在图6中未示出)。驱动机构用于驱动卷针30转动，卷针套管10套接于卷针30，卷针套管10用于卷绕层叠设置的极片21和隔膜22以形成电极组件20。
卷针套管10设有通槽11，因此在径向上具有弹性。一方面，卷针套管10或卷针30具备较粗的装配精度时，卷针套管10的弹性能够容许卷针30顺利插入于卷针套管10内，以驱使卷针套管10转动，能够有效地降低卷针套管10和卷针30的制造成本。另一方面，由于卷针套管10的内壁与卷针30的外表面的配合间隙较小，还能够缓解卷针套管10在转动过程中的跳动与弯曲现象， 使电极组件20具有较好的卷绕轴线直线度，提高了电极组件20的卷绕质量。
可以理解的是，卷针30可由钨钢、或者合金钢等具有高硬度和耐磨性特性的材料制得，以保证卷针30稳定有效地带动卷针套管10转动。
可以理解的是，在本申请的一些实施例中，如图7，卷绕装置200还包括复合机构40，用于将隔膜22复合于卷针套管10。复合机构40包括但不限于涂胶机、热烫机构、压辊机构或者钩针机构，在卷绕前，通过复合机构40能够将隔膜22的头部贴胶、热烫、压辊或缠绕粘连于卷针套管10上。卷绕装置200的驱动机构工作，卷针套管10转动，将层叠设置的极片21和隔膜22绕卷针套管10进行卷绕，卷绕结束后，卷针30由卷针套管10抽出。
请参见图8和图9，图8为本申请实施例中卷针套管10的侧视图，图9为本申请实施例中卷针30的示意图。
卷针套管10包括第一传动部13。卷针30包括第二传动部31。卷针套管10的第一传动部13与卷针30的第二传动部31相互配合，以使卷针30能够带动卷针套管10同步转动。
由于第一传动部13和第二传动部31相互配合，能够保证卷针30带动卷针套管10同步转动，从而保证了卷针30装置的卷绕效率，以及电极组件20的卷绕质量。
本申请的一些实施例中，第一传动部13包括至少一个卡槽130，卡槽130从卷针套管10的端面沿卷针套管10的轴向延伸。对应地，第二传动部31可包括凸起310，凸起310能够嵌入于卡槽130中，以实现对卷针套管10的同步传动。
第一传动部13以至少一个卡槽130的方式与卷针30实现传动配合，能保证卷针30带动卷针套管10同步运动，保证电极组件20的卷绕质量；同时，当第一传动部13包括两个或两个以上数量的卡槽130，卷针30具备与卡槽130相应数量的凸起310时，能够保证卷针30和卷针套管10之间的连接稳定性，以及能够将卷针30的卷绕动力有效地传递给卷针套管10，防止卷针30和卷针套管10在转动方向上出现打滑的情况。或者说，当第一传动部13包括两个或两个以上数量的卡槽130时，不对卷针30上的凸块的数量进行限制，其满足凸块的数量至少为一，以满足对任一个卡槽130嵌合保证卷针30对卷针套管10的传动即可。
在本申请的一些实施例中，请参见图10和图11，图10为本申请实施例中卷针套管10的端面具备三个卡槽130时的示意图，图11为图10所提供的卷针套管10的截面图。由图10和图11可知，在卷针套管10的端面，三个卡槽130和通槽11以卷针套管10的中心轴线为基准间隔均匀布设，以保证卷针套管10的结构稳定性，同时，当卷针30具有数量对等的凸起310以一一对应卡槽130时，能够保证卷针30平稳地带动卷针套管10同步转动。
请结合图12和图13，图12提供一种能够与图10提供的卷针套管10配合的卷针30的示意图，图13为图12所提供的卷针30的截面图。卷针30上设置有四个凸起310，四个凸起310以卷针30的中心轴线为基准间隔均匀布设，四个凸起310可分别嵌入于三个卡槽130和通槽11中，以平稳地带动卷针套管10同步转动。
请结合图14和图15，图14提供一种能够与图10提供的卷针套管10配合的卷针30的示意图，图15为图12所提供的卷针30的截面图。卷针30上设置有三个凸起310，三个凸起310与三个卡槽130一一对应，从而使得每个凸起310嵌入于对应的卡槽130中，以平稳地带动卷针套管10同步转动。
在本申请的一些实施例中，请参见图16和图17，图16为本申请实施例中卷针套管10的端面具备一个卡槽130时的示意图，图17为图16所提供的卷针套管10的截面图。由图16和图17可知，卷针套管10的一端面设置有一个卡槽130。在卷针套管10的端面，卡槽130和通槽11以卷针套管10的中心轴线为基准间隔均匀布设。
请结合图18和图19，图18提供一种能够与图16提供的卷针套管10配合的卷针30的示意图，图19为图18所提供的卷针30的截面图。卷针30上设置有两个凸起310，两个凸起310以卷针30的中心轴线为基准间隔均匀布设，两个凸起310可分别嵌入于卡槽130和通槽11中，以平稳地带动卷针套管10同步转动。
请结合图20和图21，图20提供一种能够与图16提供的卷针套管10配合的卷针30的示意图，图21为图20所提供的卷针30的截面图。卷针30上设置有一个凸起310，该凸起310可嵌入于卡槽130中，以平稳地带动卷针套管10同步转动。
在本申请的一些实施例中，请参见图22和图23，图22为本申请实施例中卷针套管10的端面不具备卡槽130时的示意图，图23为图22所提供的卷针套管10的截面图。
卷针套管10可不设置卡槽130，第一传动部13可包括通槽11，卷针30上的凸起310可嵌入通槽11中，同样可以实现卷针30带动卷针套管10同步运动。同时，若卷针套管10不设置卡槽130，能够降低卷针套管10的制造难度以及制造成本。其中，图18所提供的卷针30可与图20所提供的卷针套管10配合，卷针30上设置的一个凸起310可嵌入于通槽11中，同样能够带动卷针套管10同步转动。
需要说明的是，基于图10-图23所体现的实施例，卷针30上的凸起310可以嵌入卡槽130和通槽11中，也可以仅嵌入卡槽130或通槽11之一。
在上述方案中，卡槽130可通过导向槽131延伸至卷针套管10的端面，导向槽131具有两个相对的导向斜面1310，两个导向斜面1310沿导向槽131至卡槽130的方向相互靠拢，以当卷针30向卷针套管10插入时，卷针30上的凸起310可沿着任一个导向斜面1310顺利地嵌入于卡槽130中。同理，当卷针30上的凸起310可与通槽11传动配合时，通槽11的端部可同样设置导向槽131，以使得卷针30上的凸起310可沿着任一个导向斜面1310顺利地嵌入于通槽11中。
在本申请一些实施例中，凸起310可通过中间件与卷针30可拆卸地连接。将凸起310设计为可拆卸地与卷针30连接，可以及时地更换维护凸起310，保证卷针30顺利地带动卷针套管10转动。
请参见图24，图24提供了一种凸起310可拆离的卷针30的示意图，图25为图24所提供的卷针30的截面图。
中间件包括镶环311，镶环311与卷针30同轴布置，且镶环311可滑动地套置于卷针30上。凸起310形成于镶环311的端面且沿卷针30的轴向延伸。
需要说明的是，对应于卷针套管10上不同数量的卡槽130，镶环311可形成有相应数量的凸起310，例如，镶环311可形成有一个、两个、三个或者四个等凸起310。
需要说明的是，本申请实施例不对卡槽130的形状和凸起310的形状进行限定，以能够实现卡槽130与凸起310之间的传动配合，保证卷针30顺利带动卷针套管10转动即可。
示例性地，请参见图26，图26为本申请实施例中卡槽130的第一种形状以及镶环311上的凸起的第一种形状的示意图。在图26中，卡槽130呈圆头平行状，即卡槽130的末端呈半圆形，卡槽130相对的两个壁面呈相互平行状。凸起310同样为圆头平行状，即凸起310的端头呈半圆形，凸起310相对的两个表面呈相互平行状，以与卡槽130嵌合。
示例性地，请参见图27，图27为本申请实施例中卡槽130的第二种形状以及镶环311上的凸起的第二种形状的示意图。在图27中，卡槽130呈方形。凸起310同样为方形，以与卡槽130嵌合。
示例性地，请参见图28，图28为本申请实施例中卡槽130的第三种形状以及镶环311上的凸起的第三种形状的示意图。在图28中，卡槽130呈三角弧端状，即卡槽130的末端呈弧形，卡槽130相对的两个壁面相互倾斜且由卡槽130的末端过渡连接。凸起310同样为三角弧端状，即凸起310的端头呈弧形，凸起310相对的两个表面相互倾斜且由凸起310的端头过渡连接，以与卡槽130嵌合。
示例性地，请参见图29，图29为本申请实施例中卡槽130的第四种形状以及镶环311上的凸起的第四种形状的示意图。在图29中，卡槽130呈弧头平行状，即卡槽130的末端呈弧形，卡槽130相对的两个壁面呈相互平行状。凸起310同样为弧头平行状，即凸起310的端头呈弧形，凸起310相对的两个表面呈相互平行状，以与卡槽130嵌合。
示例性地，请参见图30，图30为本申请实施例中卡槽130的第五种形状以及镶环311上的凸起的第五种形状的示意图。在图30中，卡槽130呈三角尖端状，即卡槽130相对的两个壁面相互倾斜且延伸至卡槽130的末端。凸起310同样为三角尖端状，即凸起310相对的两个表面相互倾斜且延伸至凸起310的端头，以与卡槽130嵌合。
示例性地，请参见图31，图31为本申请实施例中卡槽130的第六种形状以及镶环311上的凸起的第六种形状的示意图。在图31中，卡槽130呈半圆状。凸起310的端部同样为半圆状，以与卡槽130嵌合。
以上仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (12)

  1. 一种卷针套管，其中，所述卷针套管的管壁上设有贯穿所述管壁的通槽，所述通槽从所述卷针套管的一端延伸至另一端，以容许所述卷针套管沿径向扩张或收缩。
  2. 根据权利要求1所述的卷针套管，其中，所述通槽沿所述卷针套管的轴向呈直线延伸；
    或，所述通槽绕所述卷针套管的中心轴线呈螺旋延伸。
  3. 根据权利要求1或2所述的卷针套管，其中，所述卷针套管的管壁上设有供电解液通过的通孔。
  4. 根据权利要求1-3中任一项所述的卷针套管，其中，所述卷针套管包括第一传动部，所述第一传动部用于与卷针配合，以使所述卷针能够带动所述卷针套管同步转动。
  5. 根据权利要求4所述的卷针套管，其中，所述第一传动部包括至少一个卡槽，所述卡槽从所述卷针套管的端面沿所述卷针套管的轴向延伸。
  6. 根据权利要求5所述的卷针套管，其中，所述卡槽的数量为多个，多个所述卡槽围绕所述卷针套管的中心轴线间隔分布。
  7. 一种电池单体，其中，包括电极组件和如权利要求1-6任一项所述的卷针套管，所述卷针套管设置于所述电极组件的中心孔内。
  8. 一种电池，其中，包括如权利要求7所述的电池单体。
  9. 一种用电装置，其中，包括权利要求8所述的电池，用于提供电能。
  10. 一种卷绕装置，其中，包括驱动机构、卷针和如权利要求1-6中任一项所述的卷针套管，所述驱动机构用于驱动所述卷针转动，所述卷针套管套接于所述卷针，所述卷针套管用于卷绕层叠设置的极片和隔膜以形成电极组件。
  11. 根据权利要求10所述的卷绕装置，其中，所述卷针包括第二传动部，所述第二传动部用于与所述卷针套管配合，以使所述卷针能够带动所述卷针套管同步转动。
  12. 根据权利要求10或11所述的卷绕装置，其中，
    所述卷绕装置还包括复合机构，用于将所述隔膜复合于所述卷针套管。
PCT/CN2022/099570 2021-07-30 2022-06-17 卷针套管、电池单体、电池、用电装置和卷绕装置 WO2023005502A1 (zh)

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